CRYSTAL CAVES (TM). CRYSTAL CAVES ARE ARTISTICALLY CREATED STONEWARE OR PORCELAIN PIECES THAT YOU CAN STORE YOUR CHERISHED CRYSTALS IN OR ON. EACH PIECE IS UNIQUE IN DESIGN AND COLORS. WHAT A GREAT WAY TO DISPLAY YOUR CRYSTALS ON A COFFEE TABLE, A HUTCH OR WHEREVER YOUR HEART DESIRES. WHAT A UNIQUE GIFT IDEA.